Quick answer
You free up space fastest by going to `Settings > General > iPhone Storage` to see what takes up the most space, deleting unnecessary large apps and videos, clearing Safari cache, and enabling photo optimization in iCloud. Then delete old messages and attachments, and if needed remove downloaded files from apps. This usually frees up several gigabytes without losing important data.
How to recognize the problem
- Message "Not enough storage" when trying to install or update an app
- iPhone cannot take a new photo or record video
- iOS update cannot be downloaded or installed
- Apps crash or do not work properly
- Runs slower and frequently shows storage warnings
Most common causes
Large number of photos and videos
4K videos and high-resolution photos take up the most space, especially if high-resolution recording is enabled and they are saved both in iCloud and locally.
Apps with cache and downloaded content
Social networks, messaging apps, and streaming services often store cached images, videos, and attachments that are not deleted automatically.
Old messages and attachments
iMessage and WhatsApp can store all received photos and videos that you never view, so over time they take up several gigabytes.
Downloaded files and documents
Apps like Files, Dropbox, or Google Drive can store local copies of files even when they are available in the cloud.
System data and updates
iOS occasionally stores temporary files, old installations, and diagnostic data that are not visible in the usual overview but take up space.
Step-by-step fix
- 1
Check what is taking up space
Open
Settings > General > iPhone Storageand wait for the list to load. At the top you will see total used space and suggestions for saving, and below a list of apps sorted by size. Note which apps and categories use the most. - 2
Delete unnecessary large apps
On the same screen, tap an app you do not use and select
Delete App. If you want to keep the data, first selectOffload App, which keeps documents and settings. Repeat for all apps you do not need. - 3
Free up space in photos and videos
Open the Photos app and review videos and screen recordings. Delete unnecessary ones, and then, when you are sure you do not need them, empty
Recently Deletedin the album. InSettings > Photos, enableOptimize iPhone Storageif you use iCloud Photos, so full resolutions are stored in the cloud and only smaller copies on the device. - 4
Clear cache in Safari and apps
In
Settings > Safari, tapClear History and Website Data. In apps like Instagram, Facebook, or YouTube, look for an option to clear cache in their settings. This often frees up several hundred megabytes. - 5
Delete old messages and attachments
In
Settings > Messages, check theKeep Messagesoption and set it to 30 days or one year. Note that messages older than the selected period will be permanently deleted. In conversations, delete those with large attachments. If you use WhatsApp, in itsSettings > Storage and Data > Manage Storage, delete unnecessary media. - 6
Remove downloaded files from apps
Open the Files app and review
On My iPhoneandDownloads. Delete large files you no longer need. In streaming apps (Netflix, Spotify), remove downloaded movies or playlists you do not use. - 7
Temporarily limit automatic downloads
In
Settings > App Store, turn offAutomatic Downloadsfor apps and books, and inSettings > Music, turn off automatic music downloads. InSettings > General > Software Update > Automatic Updates, temporarily turn off automatic iOS update downloads if space is critical, but install updates manually regularly. - 8
Restart the device
Sometimes temporary files and cache are not released until the device is restarted. Turn off the iPhone and turn it back on. Check in
Settings > General > iPhone Storagehow much space is now free.
If nothing helps: deeper check
If you still do not have enough space after deleting, check if Family Sharing is enabled and if a family member is using your iCloud space. In Settings > [your name] > iCloud > Manage Storage, review what is taking up iCloud space; if it is also full, you may need to upgrade your plan or delete large backups you do not need. Also, in Settings > General > iPhone Storage, at the bottom of the list there is sometimes an item System Data that can be large; you cannot delete it directly, but a restart and iOS update can often reduce it. If space is still critical, consider making a backup and restoring the device to factory settings, but only after saving everything important.
How to prevent it
- Regularly review `iPhone Storage` and delete unnecessary apps and media.
- Enable `Optimize iPhone Storage` for photos if you use iCloud.
- Set messages to delete automatically after 30 days or one year if you do not need older messages.
- Regularly install iOS and app updates; if space is critical, temporarily turn off automatic downloads.
When to call a professional
If you have tried all the steps and the iPhone still reports no space or behaves unstable, contact IT support. They can check if there is a problem with the iCloud account, make a backup, and if needed perform a deeper analysis or restore the device to factory settings.
IT infrastructure maintenance · Servers, networks, backup, security and helpdeskFAQ
How much space can I free up by clearing cache?
Clearing cache in Safari and social networks can free up from several hundred megabytes to several gigabytes, depending on how long you have been using the apps. Deleting videos and large attachments has the biggest effect.
Is it safe to delete "System Data"?
You cannot directly delete the `System Data` item on the `iPhone Storage` screen. It includes cache, temporary files, and system files. Restarting the device and updating iOS can reduce it, but it is not advisable to manually touch system files.
Why does my space fill up again quickly?
The most common reason is the accumulation of new photos and videos in full resolution, as well as apps that store cache. Regularly check what is taking up space and enable photo optimization if needed.